催产素受体表达和激活在偏交性脑干心脏神经元中的催产素受体表达和激活
bioRxiv : the preprint server for biology
|April 1, 2025
概括
催产素受体存在于脑干心脏神经元 (CVN) 中,位于阴道的背部运动核内. 激活这些表达催产素受体的CVN会引发心率的显著下降.
科学领域:
- 神经科学是一个神经科学.
- 心脏病学 心脏病学
- 自主神经系统研究 自主神经系统研究
背景情况:
- 自主失衡,标志着副交感性心神经元 (CVN) 活动减少,是许多心肺呼吸系统疾病的特征.
- 下丘脑中的催产素 (OXT) 神经元形成了CVN的刺激途径,这表明OXT是潜在的治疗标.
- 内鼻OXT在改善心脏活动和睡眠呼吸暂停的结果方面表现有前途,但潜在的机制尚不清楚.
研究的目的:
- 为了研究催产素受体 (OXTR) 在核模糊 (NA) 和迷路的背部运动核 (DMNX) 内的CVN中的分布.
- 为了确定OXT是否在这些核中激活CVN.
- 检查DMNX中选择性激活OXTR阳性CVN的功能影响.
主要方法:
- 在CVN和非CVN胆固醇神经元中对OXTR的同局部分析在NA和DMNX中.
- 使用DREADDs (仅由设计者药物激活的设计者受体) 通过Cre和flp依赖的病毒表达的化学遗传操纵.
- 在DMNX中选择性激活OXTR表达CVN.
主要成果:
- 在DMNX内,OXTR在CVN中高度表达,但在NA中没有.
- 服用OXT会增加DMNX的CVN活动.
- 在DMNX中选择性化学遗传激活OXTR+CVN诱导了快速和持续的胸.
结论:
- 催产素选择性地准并激发迷走细胞背部运动核中的心脏迷走神经元.
- 这一途径代表了OXT对自主平衡和心肺功能治疗作用的潜在机制.
- 针对DMNX中的OXTR+ CVN提供了一个有希望的策略来调节心脏自主活动.
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